revert CI changes and update index lastmod manually

.gitlab-ci.yml

@@ -1,4 +1,4 @@
-image: python:3.7
+image: python:3.6-alpine
 
 variables:
   HUGO_VERSION: '0.53'  # https://github.com/gohugoio/hugo/releases
@@ -6,6 +6,9 @@ variables:
   AWSCLI_VERSION: '1.16.21'  # https://github.com/aws/aws-cli/blob/master/CHANGELOG.rst
 
 before_script:
+  # update alpine
+  - apk update && apk add openssl coreutils
+
   # download and install Hugo
   - wget https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_${HUGO_VERSION}_Linux-64bit.tar.gz
   - echo "${HUGO_SHA}  hugo_${HUGO_VERSION}_Linux-64bit.tar.gz" | sha256sum -c
@@ -14,11 +17,11 @@ before_script:
   # install awscli
   - pip install --quiet --no-cache-dir awscli==${AWSCLI_VERSION}
 
-deploy:
+deploy: 
   script:
     # build site
     - rm -rf public
-    - hugo --gc --enableGitInfo
+    - hugo --gc
 
     # upload all files
     - aws s3 sync ./public s3://$S3_BUCKET_NAME --delete --region us-east-1 --cache-control "max-age=86400, public" --metadata-directive "REPLACE"